Nova in Cassiopea (nova Cas 2020)

Alerts and Monitoring of Novae

Re: Nova in Cassiopea (nova Cas 2020)

Postby etienne bertrand » Thu Sep 03, 2020 1:18 pm

Le spectre de la Nova Cas 2020 hier soir au LhiresIII R=14 000
En comparaison avec des étoiles Be pour voir la largeur de la raie !
3 x 1200s ; C11 ; F/10 ; Atik314L+ ; Bin1x1 ; fente 35µm
Image
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Joan Guarro Flo » Fri Sep 04, 2020 10:46 am

Hello,

You can see Nova Cas 2020 through the SC16" and the NOU_T echelle with one ATIK460EX.

Cheers, J. Guarro.
Attachments
_NOVA CAS 2020A.png
_NOVA CAS 2020A.png (14.34 KiB) Viewed 2423 times
_NOVA CAS 2020B.png
_NOVA CAS 2020B.png (12.68 KiB) Viewed 2423 times
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Francois Teyssier » Sat Sep 05, 2020 6:23 pm

Another classical nova with oscillation at maximum luminosity.

NovaCas2020.PNG
NovaCas2020.PNG (6.16 KiB) Viewed 2382 times


Daily monitoring is recommended

Database: http://www.astrosurf.com/aras/Aras_DataBase/Novae/2020_NovaCas2020.htm

François
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Christian Buil » Sun Sep 06, 2020 3:55 pm

Close look of Halpha line the 5.9 September, extracted from eShel(2) spectrum at R=12000 (T250 telescope + ASI6200MM camera):

Image

and after H2O line removed (synthetic spectrum of the atmosphere):

Image

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Re: Nova in Cassiopea (nova Cas 2020)

Postby Christophe Boussin » Tue Sep 08, 2020 10:07 pm

Hello all,

For information, a recent telegram about the spectroscopy of Nova Cas 2020 :

http://www.astronomerstelegram.org/?read=13998

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Christophe Boussin » Wed Sep 09, 2020 6:21 am

Hello all,

Here is my new update for the nova Cas 2020 with the following spectrum obtained the 6th of September at 21 h 38 TU with my Alpy 600 (resolution of 514, JJ = 2459099.4016) and an acquisition time of 70 min :

_novacas2020_20200906_902_Christophe Boussin_3750_7565.png
Nova Cas 2020 on September 6th, 2020
_novacas2020_20200906_902_Christophe Boussin_3750_7565.png (77.91 KiB) Viewed 2294 times


novacas2020_20200906_902_Christophe Boussin.png
Nova Cas 2020 on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020 (identification of lines from PlotSpectra)


The relative intensities of the Balmer lines continue to increase and more particularly that of the Halpha line. Those of [OI] lines at 6300A and 6364A have clearly increased since August 25. The lines of FeII remain evident.

Evolution of the Halpha line :
novacas2020_20200906_902_Christophe Boussin_Halpha.png
Halpha line on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020
novacas2020_20200906_902_Christophe Boussin_Halpha.png (32.19 KiB) Viewed 2294 times


Evolution of the [OI] line :
novacas2020_20200906_902_Christophe Boussin_OI.png
[OI] line on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020
novacas2020_20200906_902_Christophe Boussin_OI.png (36.27 KiB) Viewed 2294 times


Clear skies !

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Francois Teyssier » Wed Sep 09, 2020 8:41 am

Good coverage of this faint nova with peculiar light curve. Congratulations!
http://www.astrosurf.com/aras/Aras_DataBase/Novae/2020_NovaCas2020.htm

See also, e.g., Nova Sct 2017:
Sct2017.PNG
Sct2017.PNG (8.32 KiB) Viewed 2280 times


Interesting [OI] profile in Christian's spectrum:

novacas2020_20200905_950_cbuil.png
novacas2020_20200905_950_cbuil.png (16.55 KiB) Viewed 2280 times

with a narrow component (~30 km/s) at the rest wavelength
while the whole line have a FWHM ~ 570 km/s, slightly displaced to shorter wavelengths by ~ 55 km/s

Comparison with Joan's spectrum:
novacas2020_20200905_950_cbuil2.png
novacas2020_20200905_950_cbuil2.png (26.89 KiB) Viewed 2280 times


Let's go on the good work!

François
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Re: Nova in Cassiopea (nova Cas 2020)

Postby David Boyd » Wed Sep 09, 2020 10:44 am

This spectrum of the nova recorded on 8th Sept with a LISA and C11 shows a strong broad emission line centred on 7115 A which I cannot identify in the list of nova emission lines in Williams AJ 144 (2012). Also, is my identification of the broad C II line at 7235 A correct?

novacas2020_20200908_888_D_Boyd.png
novacas2020_20200908_888_D_Boyd.png (42.52 KiB) Viewed 2270 times

David
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Peter Somogyi » Thu Sep 10, 2020 8:58 pm

Quick update, for those who can follow O I 7772 or 8446:
change_novacas2020_20200908_OI7772.png

O I 7772 has lost its P-Cyg profile (always there from the beginning, at a similar magnitude).
The Ca II IRT region (9 x 1800 sec):
change_20200908_906_OI_8446.png

O I 8446 has doubled its height and EW ratio compared to Ca II IRT, and widened.
Having more spectra on the process queue, related to previous 2 comments...
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Christophe Boussin » Fri Sep 11, 2020 11:55 pm

Hello all,
For information, 2 new telegrams about the spectroscopy of Nova Cas 2020 in the visible :
http://www.astronomerstelegram.org/?read=14004
and in the near infrared (persistence of carbon monoxide emission) :
http://www.astronomerstelegram.org/?read=14006
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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